A convex mirror has a focal length of ?20 cm. What is the position of the resulting image (in cm) if the image is upright and four times smaller than the object?
a. ?100
b. ?25
c. ?50
d. ?15
e. ?10
d
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If the z-component of the magnetic field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation Bz(x, t) = (1.25 ?T) cos[(3800 m-1)x - (1.14 × 10-12 rad/s)t],
what is the largest that the y component of the electric field can be? (c = 3.0 × 108 m/s) A) 375 N/C B) 4.17 × 10-15 N/C C) 3.75 × 108 N/C D) 4.17 × 10-9 N/C E) 1.25 × 106 N/C
How would the self-inductance, L, of a coil change if you would increase its radius by a factor of two and increase its length by a factor of two?
A) L would not change. B) L would be doubled. C) L would be quadrupled. D) L would be halved. E) L would be reduced by 4.
An ideal Carnot engine operates between reservoirs having temperatures of 125°C and -20°C. Each cycle the heat expelled by this engine is used to melt 30.0 g of ice at 0.00°C
The heat of fusion of water is 3.34 × 105 J/kg and the heat of vaporization of water is 2.25 × 106 J/kg. (a) How much work does this engine do each cycle? (b) How much heat per cycle does this engine absorb at the hot reservoir?
A surface is coated with a material having index of refraction 1.41 . If light in air has a wavelength of 701 nm and is normally incident on this surface, and it is found through interference effects with this light that the surface is 11 wavelengths thick, which of the following is the thickness of the surface?
a. 4.5E–8 m b. 5.5E–6 m c. 2.7E–6 m d. 1.4E–6 m e. 2.1E–5 m